Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Check Transponder key ECU.
CHECK:

Check whether or not the engine is activated.
1. NG : Replace Transponder key ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. YES : Go to next step.

Check wire harness.

PREPARATION:

Pull out the ECU connectors mentioned below.

DTC DETECTION ITEM

Wire harness side connector of ECU	Terminal
Transponder key ECU - Driver door ECU	MPX1 (T9-4) - MPX1 (D25-17)
Transponder key ECU - Theft deterrent ECU	MPX1 (T9-4) - MPX (T5-13)

CHECK:

Check continuity of the wire harness between the connectors.

Fig 1: Checking Continuity Of Wire Harness Between Connectors

OK:

There is a continuity between the connectors.

HINT:

If there is OPEN in any wire harness, please repair it.

NG : Repair or replace wire harness.
OK : Replace Transponder key ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).